Cage construction for mills



M. F. WILLIAMS.

CAGE CONSTRUCTION FOR MILLS.

APPLICATION FILED JULY 14.1917.

1,340,643. Patented May 18,1920.

' UNITED STATES PATENT OFFICE.

MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WIIJLIAMS PATENT GBUSHER AND PULVERIZER COMPANY, OF ST. LOUIS, MISSOURI, A CORIORA- 1121011 01 MISSOURI.

Application filed July 14, 1917.

To all whom it may concern Be it known that I, MILTON F. humans, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Cage Constructions for ills, of which the following is a full, clear, [and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates generally to mills, and specifically to certain improvements in means for mounting the screen or cage in such devices.

In the accompanying illustrations, I have shown the invention asapplied to a rotary mill of the type wherein beaters or hammers are operated within a cage or grinding cylinder, a portion of which comprises a foraminous screen through which the reduced material is discharged when of proper fineness. It is obvious, however, that the particular form of cage mounting which is hereinafter claimed, may be utilized in other forms of machines besides those of this particular type.

The purpose of the invention is to provide a form of screen mounting whichwill permit the ready and rapid removal and replacement of the screen so as to facilitate repair, adaptation of the machine to clifferent materials, and variation in the predetermined grade or fineness of the products which it will turn out.

A further object is to simplify the cage mounting so as to render the mill construction more economical, and provide a form of mounting which is adapted to clamp the screen very firmly in place, and yet is adjustable to accommodate screens of a variety of thicknesses.

Other objects will be obvious or pointed out hereinafter, reference being had to the accompanying drawing, in which- Figure 1 represents a longitudinal sectional elevation of a rotary mill equipped with my improved screen mounting;

Fig. 2 represents a detail in the nature of a section through a portion of the screen and the parts forming the mounting therefor.

Referring to these illustrations by the reference characters applied, let it be under- Specification of Letters Patent.

CAGE CONSTRUCTION FOR MILLS.

Patented May 18, 1920.

Serial No. 180,548.

stood that the numeral 1 designates generally a side frame portion of the machine. two of which said side frame portions are disposed counter-facing to form supporting and housing members for the operating parts. The numeral 2 designates a cover portion which is removably mounted on the side frames '1 so that it may be moved away therefrom to expose inclosed parts. Numeral l designates a shaft arranged to be suitably driven, and upon which are carried the-boaters 5. A breaker plate 6 may be mounted on the frame portions with its work surface disposed in operative association with the heaters 5. .A screen or cage 7 is supported on the frame portions for cooperation with the heaters 5, and together with the breaker plate 6 and cover portion 2, forms the arcuate wall of the grinding cylinder. The screen 7 may be foraminous to permit the passage therethrough of sufficiently reduced material. As is well known in the art, different sorts of material require different kinds of cages or screens, and different mesh of screens are used on different occasions, depending upon the fineness of product desired. Therefore, it is quite desirable that the machine be such as to facilitate the removal and replacement of screens.

In the production of my improved cage mounting, the side frame members 1 are provided with arcuate slots or grooves which lie on the are which the screen is intended to occupy. As best seen in Fig. 2, these slots, designated by the numeral 8, are formed with the side 8 extending parallel to the axis of the grinding cylinder, and the opposite side 8 extending angularly relative thereto and convergently toward the side 8. These slots or grooves are open at the upper extremities of the frame portions 1, so that the screen 7 may be readily" slipped into them. A plurality of arcuate wedge members 9, conforming to the grooves 7 in curvature and cross section, are adapted to be fitted into the grooves against the sloping side 8". These wedge members are adapted to be retained in place in the grooves by means of suitable fastening devices, such as thebolts 10, which extend through the side frames 1 and may be drawn u by nuts 11 on the exterior of the mill. W on the bolts are so drawn up, the Wedge members 9 will be drawn into the grooves 8 and, by virtue of their engagement with the inclined walls 8, will be wedged into engagement with the screen 7 so as to clamp it against the opposite walls 8 113 the event the securing means pass through the wedge members 9. as illustrated in Fig. 2, the apertures in which they are seated will be properly elongated to permit the requisite transverse movement.

By virtue of the construction above described, the changing of screens in the mills is a very simple matter as it is necessary simply to back off the nuts 11 to an extent suliicient to release the screen from the clamping pressure, and then to withdraw the screen, replace it with another, and then tighten up the bolts to clamp it in place. By virtue of this adjustable feature a wide variation in thickness of the screens used may be accommodated, and all properly secured in place.

lVhat I claim is:

The combination with a wall provided on its inner face with an arcuate groove, said groove having an inclined face and a perforated plate having an edge thereof positioned in said groove opposite to the inclined face thereof, of an arc-shaped wedge member positioned in the groove between the perforated plate and the inclinedface of said groove, there being a slot formed in said wedge member, a clamping member passing through the wall adjacent to the groove and through the slot in the wedge member, the slot in said clamping member being of such Width as to permit the lateral movement of said clamping member, the inner end of the latter directly engaging the outer face of the arc-shaped wedge, and

means adjustably mounted on the outer end 4 of said clamping member for drawing it through the wall and exerting pressure against the wedge member.

In testimony whereof I hereunto afi'ix my signature this 9th day of July, 1917.

MILTON F. WILLIAMS. 

